OK I got it running. What I had to do was cherry pick 3 commits to bring develop branch up to even with v5_0 branch. I was having the same segfault with the sgminer-dev/sgminer:develop as with your badman74/sgminer:develop branch.

The commits I cherry picked were:

82b5320 - https://github.com/badman74/sgminer/commit/82b5320f36913f3c330633021a4800ce89c4ccc2#diff-d41d8cd98f00b204e9800998ecf8427e

dbe0263 - https://github.com/badman74/sgminer/commit/dbe0263c2d9d12d2595d2aece69d1d1d5d22ed5e#diff-d41d8cd98f00b204e9800998ecf8427e

3ddffaa - https://github.com/badman74/sgminer/commit/3ddffaa915add904d0bfedd25b2b5383cff9035f#diff-d41d8cd98f00b204e9800998ecf8427e

I don't really know how to merge those commits back over into the develop branches of your repo or the sgminer-dev repo on github and I don't want to mess anything up so if you can check that out, let me know.

So far, without any additional config changes over my v5_0 binaries I am seeing 2-4% increase in hash rates.

Would you mind summarizing the new config options I should be trying out? and which values you think are best? (my cards are 7950s and R9 270 non-x)